Pls help it’s due this period will give many points!

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

How do you use the elimination method for this question? explain, because i really want to understand!